Fuel and vacuum pump with hand primer



July 26, 1955 G. w. HARRY ET AL 2,713,830

FUEL AND VACUUM PUMP WITH HAND PRIMER v Filed Deo. 24, 1951 2 Sheets-Sheet l E 2 ZQLM M- (Ittornegs July 26, 1955 Filed Dec. 24, 1951 G. W. HARRY ET AL FUEL AND VACUUM PUMP WITH HAND PRIMER 2 Sheets-Sheet 2 Brwentors B l E i' '7g Gttornegs United States Patent C) r"ice anni. AND VACUUM rui/n wrrn HaNn ranma Gordon Vi. Harry and William E. Barnes, Flint, Mich., assignors to General Motors' Corporation, Detroit, Mich., a corporation of Delaware Application Uecexnher 24, i951, Serial No. 263,074

s Claims. (ci. rc3- 297) This invention relates to pump primers and more particularly to an improved hand priming mechanism for a fuel pump which directly contacts the pump acting lever.

This fuel pump primer mechanism was developed for military vehicle use where rugged service requirements demand a strong, reliable and readily accessible hand primer for the fuel pumps. The pump primers that were available did not meet all of these requirements. The present fuel pump primer provides a plunger which is mounted for reciprocation in the pump housing to engage the pump actuating lever. The plunger is directly driven by a shaft and crank mechanism. The handle secured to this shaft for operating this mechanism is located conveniently at the front of the pump opposite the mounting pad and the cam lever.

The primary object of the invention is to provide in a pump mechanism a hand primer consisting of a hand actuating mechanism for a reciprocating plunger arranged to contact a part of the pump drive mechanism.

Another obiect of the invention is to provide in a fuel pump mechanism, a hand primer consisting of a hand actuating portion located at the front of the pump and opera-tively connected to a reciprocating plunger positioned to engage the pump actuating lever.

These and other obiects of the invention will be more fully described in the accompanying drawing and specilication describing a preferred embodiment of the invention.

Fig. 1 is a partial section of a fuel and vacuum pump showing the invention.

Fig. 2 is a section on the line 2-2 of Fig. 1.

Fic. 3 is a partial back end view of the pump with parts broken away to show a portion of the primer.

Fig. 4 is a partial front end view of the pump showing the handle of the pump primer.

The invention is illustrated in connection with a fuel and vacuum pump similar to that shown in the Babitch Patent 2,189,526. The pump housing l is assembled from 4three major body portions. The central or intermediate body portion l2 contains the pump operating levers and has a central cavity i4 containing the pump operating levers and a circular recess 16 on the vacuum pump side and a similar circular recess 18 on the fuel pump side to provide a portion of the pumping chambers. The vacuum pump body 20 is located beneath the intermediate body portion l2 and contains the vacuum pump diaphragm 22. The vacuum body 20 is secured to the intermediate body by screws and clamps, and seals the diaphragm 22 in place. The diaphragm 22 is driven in the conventional manner by a reciprocating rod 24 secured to the diaphragm which passes through seal 25 in the lower portion of the intermediate body 12. The rod 24 is connected by a slot connection to the actuating lever 26 which is pivoted on the shaft 28. The shaft 28 (herein called the first shaft) is xed to the side walls of the intermediate body portion 12. A cam operating lever 30 has a fixed spring abutment 31 which engages spring 33 seated between the abutment and in- Zfll@ Patented July 26, 1955 termediate body portion l2. The cam operating lever 30 which contacts the pump operating cam 32 is also pivoted on the rst shaft 28 and has an abutment portion (not shown) which contacts an abutment on the actuating lever 26 and operates the actuating lever 26 in a conventional manner. The structural details and the operation of the operating levers and the arrangement of the vacuum pump valves and their operation are more thoroughly explained in the above Babitch patent. The fuel pump body 34 is secured to the outside of the central housing portion l2. The lower wall of the fuel pump housing 34 is shaped to form a circular cavity 36 similar to the cavity 18 to provide a fuel pump chamber for the diaphragm 38. The fuel pump body portion 34- is secured to the center of body portion l2 and clamps and seals the diaphragm 38 in the pump chamber. The diaphragm plates 40 and 42 are positioned on the top and bottom of the diaphragm respectively. These diaphragm plates are held tightly about the diaphragm by means of the pump rod 44 and provide means for securing pump rod to the diaphragm. The pump diaphragm 3S is continuously urged to the upper position by the spring 45 which engages the lower side of the pump diaphragm, seating on plate 42, and fits in a recess 43 in the pump housing l2 seating on an abutment ring S0 fitted in the bottom of the recess 48.

The piston rod 44 is connected to the fuel pump actuating lever 52 by a pin and slot connection consisting of the end of the lever 52 entering a slot in rod 44. The actuating lever 52 is pivoted to the shaft 28 and has an abutment surface thereon. The cam lever 3l) has another abutment which engages the abutment on actuating lever S2 to operate it7 as explained in the above noted Babitch patent, the spring 46 moves the diaphragm 38 up on the pumping stroke when the cam 32 rotates the lever 3u, the abutment on lever 36 engages the abutment on lever 26 and pulls the lever 26, rod 44 and diaphragm 38 down to compress the spring. If the spring does not expand due to high pressure in the lines the operating arm idles due to its lost motion connection and does not move the operating lever 26.

The fuel pump body 34 is vertically divided by a partition 54 into a fuel receiving chamber 56 and a fuel delivery chamber 58. An inlet port 60 is provided to connect the fuel pipe line to the pump receiving chamber S6 and an inlet check valve 62 connects the receiving chamber 56 to the pumping chamber 36. The pumping chamber 36 is connected by the outlet check valve 64 to the delivery chamber 58 which has an outlet 66 which may be connected to the outlet pipe of the fuel supply system. The chambers 56 and 58 of the fuel pump body 34 are sealed by a cap plate 58.

As best shown in Figure 4 the fuel pump hand primer mechanism is actuated by a handle 70 which may be directly actuated or indirectly actuated by a suitable linkage system connected to the handle 70. A shaft 72 (herein called the second shaft) which is rotatably mounted in a transverse bore 73 in the intermediate body 1.2, carries the hand priming motion from the front of the pump to the rear of the pump where it actuates the pump actuating lever S2. The forward end of the second shaft 72 has a flat 74 to receive the hand lever 70 which has an aperture 76 fitting over the end of the shaft 72. The shaft end is upset or riveted to hold the handle 70 in position on the second shaft 72. The keeper plate 78 is suitably secured to the front of the pump housing portion 12 by a screw 80 and has at one end a circular cutout 82 concentric with the shaft 72. The keeper 78 fits outside of the handle 70 and thus positions the shaft 72 in the bore 73 in the housing. As best shown in Figure 2 the shaft 72 extends rearwardly through the bore 73 in the pump housing and passes to one side of the recess 48. The rear end of the shaft 72 has a flat 84. The cam lever 86 has an aperture 8S at one end with a suitable flat to fit over the end of shaft and key lever 86 to the shaft. The lever 86 extends toward the center of the pump to the rear of recess 48 and has a lengthwise slot 90 at the other end. This end is located over the pump actuated lever 52. At this point a round aperture 92 is provided in the pump housing to guide the round cross head member 94 in its limited reciprocating vertical movement. Cross head member 94 has an axial slot 96 and a transverse pin 98 which fits within the slot 9i) and thus connects the cam lever 86 to the cross head member 94. The cross head member 94 has an extension 102 which extends downwardly and contacts the top edge of the pump actuating lever 52.

The pump operating levers operate in the conventional way. The cam lever 30 is moved by the cam 32 toward and away from the pump body. The spring 33 acting continuously on the arm 31 which is a portion of the cam lever 3d continuously maintains the cam lever 30 in contact with the cam 32. When the pressure of the discharge chamber 58 is sufficiently low to permit the spring 46 to force the fuel through the check valve 64 into the discharge chamber 58, the spring will raise the diaphragm 38 and the rod 44. When the rod 44 is moved upward by the spring 46, the actuating lever 52 will be moved clockwise. Thus when the cam lever 30 is moved counterclockwise by the cam 32, the abutments on the cam lever and actuating lever will move the actuating lever 52 counterclockwise with it and recompress spring 46 for the next pump discharge stroke in the conventional manner. If it is desired to prime the pump by hand, the hand pump primer lever 7 t) is oscillated. Since the lever 7) is keyed to shaft 72, the shaft oscillates and in turn oscillates the cani lever S6. This lever by the pin 98 and slot 99 connection with the crosshead member 98 reciprocates the cross head member. When the crosshead member 94 is reciprocating in the pump body, its terminal portion 102 engages the fuel pump actuating lever 52 and moves the lever counterclockwise and compresses the pump actuating spring 46 until rod 44 travels to the stop in the lower portion of the intermediate body 12. When the crosshead 94 is withdrawn, the spring 46 operates the pump on the delivery stroke. This operation may be repeated to provide the desired hand priming action. When the pump is operated by the cam lever 3i) the priming plunger 94 and the terminal portion 102 is held out of the path of the pump actuating lever 52 by the friction of the priming linkage or the Weight of handle 70. Also a retraction spring may be attached to handle 70 or the control such as a Bowden wire to hold the handle 7i) down.

The detailed description herein of a preferred embodiment of the invention is not to be considered limiting the invention since many modifications will occur to those skilled in the art within the scope of the invention, as defined in the appended claims.

We claim:

l. 1n a fuel pump, a pump housing, a pump chamber in said housing, a first shaft mounted in said housing, pumping means mounted in said pumping chamber, pump drive means connected to said pumping means to drive said pumping means including a pump actuating lever oscillatable about said first shaft, drive means mounted on said first shaft to engage and operate said pump actuating lever, a second shaft mounted in said housing at an angle with said first shaft and having a portion extending outside of said housing, a lever secured to said second shaft and operatively engageable with said actuating lever, and an operating member secured to said second shaft portion outside of said housing.

2. 1n a fuel pump, a pump housing, a pump chamber in said housing, a first shaft mounted in said housing, pumping means mounted in said pumping chamber, pump drive means connected to said pumping means to drive said pumping means including a pump actuating lever Cir mounted on said first shaft, drive means mounted in said pump housing for movement to engage and operate said pump actuating lever, a second shaft mounted in said housing at right angles to said first shaft, and having a portion extending outside of said housing, a cross-head secured to said second shaft and operatively engageable with said lever by means of a pin and slot connection, and a handle secured to said shaft portion outside of said housing.

3. In a fuel pump, a pump housing, a pump chamber in said housing, pumping means mounted in said pumping chamber, pump drive means connected to said pumping means to drive said pumping means including a spring and an oscillating pump actuating lever, a cross head mounted in said pump housing for reciprocating movement to engage and move said pump actuating lever, against the action of said spring, a shaft mounted in said housing at right angles to said cross head and having a portion extending outside of said housing, a lever secured to said shaft and operatively connected to said crosshead, and a handle secured to said shaft portion outside of said housing.

4. In a fuel pump, a pump housing, a pump chamber in said housing, pumping means mounted in said pumping chamber, pump drive means connected to said pumping means to drive said pumping means including a spring and an oscillating pump actuating lever, a cross head mounted in said pump housing for reciprocating movement to engage and operate said pump actuating lever, a shaft mounted in said housing at right angles to said crosshead and having a portion extending outside of said housing, a lever secured to said shaft and having a pin and slot connection to said crosshead, and a handle secured to said shaft portion outside of said housing.

5. In a fuel pump, a pump housing, a pump chamber in said housing, pumping means mounted in said pumping chamber, pump drive means connected to said pumping means to drive said pumping means including a spring acting in one direction and a pump actuating lever effective in the opposite direction, drive means mounted in said pump housing for movement to engage and operate said pump actuating lever in said opposite direction, said drive means normally being out of the path of said pump actuating lever, a shaft mounted in said housing having a portion extending outside of said housing, a lever secured to said shaft and operatively connected to said drive means, a handle secured to said shaft portion outside of said housing, and a keeper member fixed to said housing and engaging the outside surface of said handle to hold said handle and shaft assembly in position longitudinally.

6. In a fuel pump, a pump housing, a pump chamber in said housing, pumping means mounted in said pumping chamber, pump drive means connected to said pumping means to drive said pumping means including an oscillating pump actuating lever, a crosshead mounted in said pump housing for reciprocating movement to engage and operate said pump actuating lever, a shaft mounted in said housing at right angles to said cross head and having a portion extending outside of said housing, a lever secured to said shaft and operatively connected to said crosshead, a handle secured to said shaft portion outside of said housing, and a keeper member fixed to said housing and engaging the outside surface of said handle to hold said handle and shaft assembly in position o longitudinally.

References Cited in the file of this patent UNiTED STATES PATENTS 1,513,052 Larkin Oct. 28, 1924 1,942,549 Hampton Jan. 9, 1934 1,991,537 Babitch Feb. 19, 1935 2,254,174 Edwards Aug. 26, 1941 2,318,128 Tabb May 4, 1943 2,348,538 Hagen May 9. 1944 

